Question

An aggregate which passes through 25 mm IS sieve and is retained on at 20 mm IS sieve, is said to be flaky if its least dimension is less than ______

• A. 22.5 mm
• B. 18.5 mm
• C. 16.5 mm
• D. 13.5 mm

Answer 1

The correct option is D 13.5 mm

The aggregates are said to be flaky if their least dimension is less than 0.6 times their average dimension.
If the aggregate passes through a 25 mm sieve and is retained on a 20 mm sieve, then their mean dimension equals
$\frac{20+25}{2}=22.5mm$

So, as per definition of flaky aggregate the aggregate is said to be flaky if its least dimension is less than
$0.6\times 22.5=13.5mm$.